Question

Simplify the following algebraic expressions:
1) (x + 2y + 3z) - ( 42 – 2x + 7y)​

Answer 1

$\left(x+2y+3z\right)-\left(42-2x+7y\right)$

$=x+2y+3z-\left(42-2x+7y\right)$

$=x+2y+3z-42+2x-7y$

$=3x-5y+3z-42$